Only Custom Competition Nosler bullets that I've used have been 77 grain bullets for .223 Rem in my White Oak Armament Match AR. They shoot as well or better than Sierra's 77 Match King in my rifle. Some say Sierra's are slightly more accurate and some say that the CC Noslers are better in their rifles. I think that the Nosler's with their lower cost are definitely worth a try. In my tests load data for the Nosler and Sierra 77 gr. BTHP match bullets can be interchanged.